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style: Support ray() in offset-path and make it animatable.

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1. Add `generics::motion::OffsetPath`, and use specified `Angle` and
   computed `Angle` to define specified `OffsetPath` and computed `OffsetPath`.
2. Add `ray` function into `OffsetPath`.

We also tweak the degree from 150deg to 135deg in wpt (e.g.
offset-path-ray-001.html and others) to avoid floating point precision issues.
For example:
```
// offset-path: ray(150deg ...);
// offset-distance: 20px;
matrix:
{
  {0.500000 0.866025 0.000000 0.000000},
  {-0.866025 0.500000 0.000000 0.000000},
  {0.000000 0.000000 1.000000 0.000000},
  {10.000000 17.320509 0.000000 1.000000}
}

// rotate(60deg) translate(20px)
matrix:
{
  {0.500000 0.866025 0.000000 0.000000},
  {-0.866025 0.500000 0.000000 0.000000},
  {0.000000 0.000000 1.000000 0.000000},
  {10.000000 17.320507 0.000000 1.000000}
}
```
Their translate parts, 17.320509 vs 17.320507, are almost the same (only
tiny difference), which may cause the reftest failed.

Differential Revision: https://phabricator.services.mozilla.com/D42721
This commit is contained in:
Boris Chiou 2019-09-16 23:24:48 +00:00 • committed by Emilio Cobos Álvarez
parent 35a98af0ed
commit 5e77ba9bf4
5 changed files with 172 additions and 53 deletions
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7
components/style/values/computed/motion.rs
View file

@ -5,12 +5,11 @@
//! Computed types for CSS values that are related to motion path.
use crate::values::computed::Angle;
use crate::values::generics::motion::GenericOffsetPath;
use crate::Zero;
/// A computed offset-path. The computed value is as specified value.
///
/// https://drafts.fxtf.org/motion-1/#offset-path-property
pub use crate::values::specified::motion::OffsetPath;
/// The computed value of `offset-path`.
pub type OffsetPath = GenericOffsetPath<Angle>;
#[inline]
fn is_auto_zero_angle(auto: &bool, angle: &Angle) -> bool {